Defensive publication

ABSTRACT

WHERE R AND R1 ARE EACH HYDROGEN, A HYDROXYL GROUP, A MERCAPTO GROUP, AN ALKOXY GROUP, A THIOALKOXY GROUP, AN AMINO GROUP, A CARBOXYL GROUP, A CARBOALKOXY GROUP, OR A HALIDE. SPECIFIC 1-THIA-2,3,5,7-TETRAZAINDENE DERIVATIVES WHICH ARE DISCLOSED ARE 4-BENZYLAMINO-1-THIA-2,3,4,7TETRAZAINDENE, 4-AMINO-1-THIA-2,3,5,7-TETRAZAINDENE AND 4CHLORO-1-THIA-2,3,5,7-TETRAZAINDENE. THESE COMPOUNDS, IN CORPORATED IN A FOG STABILIZING CONCENTRATION INTO PHOTOGRAPHIC LAYERS SUCH AS AN EMULSION COATED ONTO A SUPPORT, PROVIDED SIGNIFICANT DECREASES IN INCUBATION FOG. SILVER HALIDE EMULSIONS AND ELEMENTS STABILIZED AS DESCRIBED CAN BE CHEMICALLY SENZITIZED, E.G. WITH NOBLE METAL SENSITIZERS ALONG OR IN COMBINATION WITH SULFUR OR SELENIUM SENSITIZERS. THEY CAN CONTAIN SPECTRAL SENSITIZERS, INCORPORATED COLOR FORMING COUPLERS, INCORPORATED DEVELOPING AGENTS, OTHERE ANTIGOGGANTS, HARDERS, PLASTICIZERS, COATING AIDS, AND OTHER SUITABLE PHOTOGRAPHIC ADDENDA SUCH AS DESCRIBED IN U.S. PAT. 3,297,446 ISSUED TO DUNN ON JAN. 10, 1967.   THERE ARE DISCLOSED PHOTOGRAPHIC SILVER HALIODE EMULSIONS AND PHOTOGRAPHIC ELEMENTS CONTAINING A FOG STABILIZING AMOUNT OF A 1-THIA-2,2,5,7-TETRAZAINDENE DERIVATIVE HAVING A FORMULA

DEFENSIVE PU LICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Olfice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JUNE 1, 1971 T887,009 FOG STABILIZERS FOR PHOTOGRAPHIC EMULSIONS Dorothy Johnson Beavers and Norman Wayne Kalenda, both of Kodak Park Division, Rochester, N.Y. 14650 Filed June 22, 1970, Ser. No. 48,553 Int. Cl. G03c 1/34 US. Cl. 96-109 No Drawing. 12 Pages Specification There are disclosed photographic silver halide emulsions and photographic elements containing a fog stabilizing amount of a 1-thia-2,3,5,7-tetrazaindene derivative having the formula wherein R and R are each hydrogen, a hydroxyl group, a mercapto group, an alkoxy group, a thioalkoxy group, an amino group, a carboxyl group, a carboalkoxy group, or a halide. Specific 1-thia-2,3,5,7-tetrazaindene derivatives which are disclosed are 4-benzylamino-1-thia-2,3,5,7- tetrazaindene, 4-amino-1-thia-2,3,5,7-tetrazaindene and 4- chloro-1-thia-2,3,5,7-tetrazaindene. These compounds, incorporated in a fog stabilizing concentration into photographic layers such as an emulsion coated onto a support, provide significant decreases in incubation fog.

Silver halide emulsions and elements stabilized as described can be chemically sensitized, e.g. with noble metal sensitizers alone or in combination with sulfur or selenium sensitizers. They can contain spectral sensitizers, incorporated oolor forming couplers, incorporated developing agents, other antifoggants, hardeners, plasticizers, coating aids, and other suitable photographic addenda such as described in US. Pat. 3,297,446 issued to Dunn on Jan. 10, 1967. 

